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Chapter 22
This table containsinformation on the sample design pertinent to the estimation of the model.
There is one case per subject, and all 5,687 cases are used in the analysis.
The sample represents less than 2% of the entire estimated population.
Thedesignrequested4strataand5unitsperstrataforatotalof20unitsinthefirst stage of
the design. The sampling design degrees of freedom are estimated by 20−4=16.
Testsof Model Effects
Figure 22-13
Testsof model effects
In the proportional hazards model, the significance value for thepredictor age is less than 0.05
and, therefore, appears to contribute to the model.
Testof Proportional Hazards
Figure 22-14
Overall test of proportional hazards
Figure 22-15
Parameter estimates for alternativemo del
The significance value for the overall test of proportional hazards is less than 0.05, indicating that
the proportional hazardsassumption is violated. The log time function isused for the alternative
model, so it will be easy to replicate this time-dependentpredictor.
Adding a Time-Dependent Predictor
ERecall the Complex SamplesCox Regression dialog box and click the Predictors tab.